使用AlarmManager进行定时任务处理

1：UploadingService.java

package com.example.service;

import com.example.broadcast.AlarmReceiver;
import com.example.utils.DateUtil;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.os.SystemClock;

public class UploadingService extends Service{

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        //to-do
        System.out.println("===========:"+DateUtil.getDateByFormat("yyyy-MM-dd HH:mm:ss"));

        AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
        int seconds = 1000*3;
        long triggerAtTime = SystemClock.elapsedRealtime()+seconds;
        Intent i = new Intent(this, AlarmReceiver.class);
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
        am.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pi);

        return super.onStartCommand(intent, flags, startId);
    }

    public static void openService(Context context){
        Intent intent = new Intent(context, UploadingService.class);
        ((Activity)context).startService(intent);
    }
}

2：AlarmReceiver.java

package com.example.broadcast;

import com.example.service.UploadingService;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class AlarmReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent i = new Intent(context, UploadingService.class);
        context.startService(i);
    }
}

3：MainActivity.java

UploadingService.openService(MainActivity.this);

4：AndroidManifest.xml

<service
            android:name="com.example.service.UploadingService"/>
        <receiver
            android:name="com.example.broadcast.AlarmReceiver"/>